from operator import itemgetter
from itertools import *
from bisect import *
from collections import *
from heapq import *
import sys

# input=sys.stdin.buffer.readline
input=sys.stdin.readline

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(input())
def MI(): return map(int, input().split())
def MI1(): return map(int1, input().split())
def LI(): return list(map(int, input().split()))
def LI1(): return list(map(int1, input().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return input()[:-1]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
dij = [(1, 0), (0, 1), (-1, 0), (0, -1)]

class BitSum:
    def __init__(self, n):
        self.n = n+1
        self.table = [0]*self.n

    def add(self, i, x):
        i += 1
        while i < self.n:
            self.table[i] += x
            i += i & -i

    # [0,i]の和
    def sum(self, i):
        i += 1
        res = 0
        while i > 0:
            res += self.table[i]
            i -= i & -i
        return res

n=II()
aa=LI()
bb=LI()
aa.sort()
ai=[(a,i) for i,a in enumerate(aa)]
bj=[(a,i) for i,a in enumerate(bb)]
ai.sort()
bj.sort(reverse=True)

bit=BitSum(n+5)
ans=0
for a,i in ai:
    while bj and bj[-1][0]<a:
        b,j=bj.pop()
        bit.add(j,1)
    ans+=bit.sum(i)
    # print(a,i,bj,ans)

print(ans)